我是Android开发的新手,我正在尝试弄清楚如何使用onTouchEvent连续旋转图像。当onTouchEvent检测到屏幕触摸时,我使用以下代码将图像旋转10度,反之亦然,但我希望只要onTouchEvent发生,图像就会以10度的间隔保持旋转。谢谢!
@Override
public boolean onTouchEvent(MotionEvent event) {
if(event.getAction()==MotionEvent.ACTION_DOWN) {
degrees=degrees+10;
make(degrees);
}
else if(event.getAction()==MotionEvent.ACTION_UP) {
degrees=degrees-10;
make(degrees);
}
return super.onTouchEvent(event);
}
}
答案 0 :(得分:0)
使用:
degrees = (degrees + 10) % 360;
// ...
if(degrees < 10) degrees += 360;
degrees = (degrees - 10) % 360;
答案 1 :(得分:0)
据我了解,您想要在用户将手指放在屏幕上时开始旋转图像,并在用户从屏幕上取下手指时停止旋转。
如果这是正确的,你需要在背景上启动线程或处理程序。
可能是这样的:
// flag to tell if the rotation should continue
private boolean keepRotating = false;
// instance variable to keep the current rotation degrees
private int degrees = 0;
// rotation interval in milliseconds
private static final int INTERVAL = 100;
@Override
public boolean onTouchEvent(MotionEvent event)
{
switch (event.getAction())
{
case MotionEvent.ACTION_DOWN:
startRotating();
break;
case MotionEvent.ACTION_UP:
stopRotating();
break;
}
return super.onTouchEvent(event);
}
public void startRotating()
{
if (!keepRotating)
{
keepRotating = true;
final Handler handler = new Handler();
handler.postDelayed(new Runnable()
{
@Override
public void run()
{
if (keepRotating)
{
degrees = (degrees + 10) % 360;
make(degrees);
handler.postDelayed(this, INTERVAL);
}
}
}, INTERVAL);
}
}
public void stopRotating()
{
keepRotating = false;
}
public void make(int degrees)
{
Log.i(this.getClass().toString(), "Rotation : " + degrees);
// Your rotation logic here based on the degrees parameter
// ...
}
答案 2 :(得分:0)
使用以下代码
public void startMoving() {
rotateAnimation1 = null;
try {
if (duration < 1500) {
rotateAnimation1 = new RotateAnimation(0, 360,
Animation.RELATIVE_TO_SELF, 0.5f,
Animation.RELATIVE_TO_SELF, 0.5f);
rotateAnimation1.setInterpolator(new LinearInterpolator());
rotateAnimation1.setDuration(duration);
rotateAnimation1.setRepeatCount(0);
imgBottle.startAnimation(rotateAnimation1);
flagSpinAvailable = false;
rotateAnimation1.setAnimationListener(new AnimationListener() {
public void onAnimationStart(Animation anim) {
};
public void onAnimationRepeat(Animation anim) {
};
public void onAnimationEnd(Animation anim) {
duration = duration + 70;
startMoving();
};
});
} else {
duration = duration + 100;
final float degree = (float) (Math.random() * 360);
degreeBack = 360 - degree;
rotateAnimation2 = new RotateAnimation(0, degree,
Animation.RELATIVE_TO_SELF, 0.5f,
Animation.RELATIVE_TO_SELF, 0.5f);
rotateAnimation2.setInterpolator(new LinearInterpolator());
rotateAnimation2.setDuration(duration);
rotateAnimation2.setRepeatCount(0);
rotateAnimation2.setFillAfter(true);
imgBottle.startAnimation(rotateAnimation2);
rotateAnimation2.setAnimationListener(new AnimationListener() {
public void onAnimationStart(Animation anim) {
};
public void onAnimationRepeat(Animation anim) {
};
public void onAnimationEnd(Animation anim) {
afterSpinEnd();
};
});
}
} catch (Exception e) {
flagSpinAvailable = true;
e.printStackTrace();
}
}
这是我的代码,用于围绕自身旋转图像并慢慢降低速度